The addictive million-copy bestseller mystery taking Japan by storm, from the author of The Times Bestseller Strange Pictures

A twisty puzzle in which the reader is the detective, examining a series of creepy floorplans for clues

A sinister hidden room.
A dead space between two walls.
A sealed cellar.
A child’s face glimpsed at a window.

Every house hides secrets.
But some secrets are far darker than others.
More than a million readers have discovered the terrible truth behind these strange houses.
Now it’s your turn.